Again, people rate batsman differently. Some people would say players like Trumper, Gower and Mark Waugh were better batsman, simply because of how stylish and elegant they were. I don't think anyone here has said they don't consider Imran a top 15 fast bowler, but rather that it is possible to make a case for 15 or so fast bowlers. For example, I myself don't rate Larwood very highly, but there are people who consider him the greatest fast bowler of all time. Hell, there're probably people who think it'd be ridiculous to have an ATG XI without WG Grace and Fred Spofforth.
Now, 30 batsmen who could be considered better than Kallis: Bradman, Sobers, V.Richards, Hobbs, Sutcliffe, Headley, Hutton, Pollock, Hammond, Ponting, Lara, Dravid, Tendulkar, G.Chappell, Border, S.Waugh, Gavaskar, Greenidge, B.Richards, Trumper, Gower, M.Waugh, Barrington, Compton, Ranji, McCabe, Weekes, Walcott, Worrell, Gilchrist.
Also Agent_Nationaux, if its ridiculous to compare Larwood and Lindwall to someone like Imran Khan, isn't it also ridiculous to compare Bradman to Tendulkar? Tendulkar must be much better then! Also, I don't understand whats so ridiculous about rating Procter or Richards highly. Sure, both had very limited opportunities in tests, but they both performed well in their short careers, and followed it up by playing exceptionally well in one of the most competitive eras for first class cricket.